Only just recently, I complained about an everlasting performance problem.
Shortly after writing this, I stumbled upon this nice tweak (thanks michaelvandeborne!):
- Click on File | New Tab
- Enter about:config, then promise that you’ll be careful.
- Enter songbird.dbengine.cacheSize
- Increase the value. Start with 5000.
You might also try to increase or lower it a little and see if the performance increases any further.
IT affinity! 
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